VR-299 2-Month Duration Bodenstadluhren by M. Halbkram

Martin Halbkram is one of the 3 or 4 top Viennese makers of the last quarter of the 1800's. A maker to the Imperial Royal Court, this mechanism reflects the exceptional quality of his mechanisms as well as unusual features one would expect to find on a mechanism from a master. Details are pointed out in the text below the photos in this gallery.

The slotted washer that retains both the winding drum gear and the maintaining power year was apparently damaged (a not uncommon problem) and replace with one that was 3 times too thick (on left above). It fit so tightly that the maintaining power was frozen in place. Making the washer on the left gave me a chance to use a shellac chuck for turning the initial disc from which I then cut the center hole and the slot.